Incandescent body for electric glow-lamp.



-which it eppertaine to make end use the Nacuuiu, until the materials arc fritted to :1.

UNITED s'rA'rne PATENT. OFFICE.

WERNER V. BOLTON. OF UHARLCJTTENBURG, GERMANY, ASSIGNORTO SIEMENS d: HALSKE AK'IIENGESELLSCHAFT, OF BERLIN, GERMANY.

INCANDESCENT BODY FOR enecimo GLOW-mm.

Specification of'Letters Patent.

Patented March 10, 1909.

Original application filed May 31, 1802, Serial No. 109,792. Dividedand this application filed July 10, 1906.

Serial No.

To all whom it may concern:

Beit known thetl Wnnunn You BOLTON, chemist, as. subject oi the Russian Emperor, residing at 10 Am Liitzow, Charlottenburg, near Berlin, Germany, have invented certain new and useful Improvements in Incandescent Bodies for Electric Glow-Lain s; and I do hercb declare the following toe a full, clear, an ex'ect description of the invention, such us will enable others skilled in the art to some.

My invention relates to improvements in incnndescing bodies for electric glowdamps.

The object of the invention is to provide an incnndcscing body which will he've sulficient mechanical strength and electrical conductivity to insure u hie of the glow-lam of sulficient duration to meet commercial amends.

The invention which terms the subjectmatter of this upplicutiou is un incenclescing body GOllSl-Stlllff of a wbetuutiolly homogeneous intimate y comminglcd mixture of ourbid of metal of the \-':l.lldiLllll group with a. motel whose melting point is above 2000 0, such, for example, us. a metal ol said vcne.. LllULll group having such a high meltin point.

According to my ircscut invention mix a, finely divided motel ol the vanadium group having at melting mint above 2000U with a curbid of u motel or with cur-hide of metals of the vumuliurn group, to form on intimately cum mingled, substantially homogeneous mixture. ()r I may mix. such metal with such it uunliiy of u sllllrtlilu binding sub stance, or oxiuupln, ruoult'llnuc, l-hut the amount of rail'lmu iu the moss is sulllciculi to mmvvl'l. n purl. but. not :ill of the motel, into curbid. 'lhu unituriul Lhus o )luincil by mixiog motel and binding suhstuuoc is heated in an inert nnvh'onnu-nt, us for cxm'nplc, in it substnniinllr lmuiogn-m-ous oolwrnnt nurse of intiinnuly cunuuiughul motel undcurhid.

in curryiug out my invention l umy procccd as follows: i stun. with the amorphous powder of the desirmi metal, For example, tuniuluw. mid hv u;-;lug thin iunornhous powder with a suitable binding substance, such as caoutchouc, which can he carbonized by heating, I form a lastic mass, which is then given the desir shape. The raw body thus obtained may have its ends attachcd. to the terminals of an electric circuit and is then heated to a. high temperature in product bein at substantially homo neous inceudescent ody containing 9. meta, of the vanadium group whose melting point is over 2000 C., and a cerbid of a metal of such rou g The most-ndvantaigeous'form of myinvention is a. substantially homogencoueincaudescent body of intimately comrriin led metallic tantalum and tantalum cariid; which may be made as above described.

Having thus fully described my invention, what I claim is 1. An Incnndcscing body for electric glow lumps, consisting of a. substantially homoge neous mass containing metallic tantalum 1ntimutely commingled with a carbid of motel of the vanadium grou 2. An incnmlescinglbody for electric gloiw lumps, consisting of 11. substantially homogeneous mixture of metallic tantalum, inti mute-1y comiuiuglcd with u csu'hid of metal of the vanadium group.

3. An iucuiulescing body for electric glow lumps, consisting ole substantially homogeneous mixture of metallic tantalum intinuttcly cmmningled with cerbid of tantalum.

In testimony whereof I hereunto uliix my signature in the presence of two witnesses.

WERNER V. BOLTON.

Witnesses Wowmuui HAUm, HENRY I'IASIER. 

